Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/6216#discussion_r30487662
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/DataFrameWriter.scala ---
@@ -151,19 +153,52 @@ final class DataFrameWriter private[sql](df:
DataFrame) {
/**
* Saves the content of the [[DataFrame]] as the specified table.
*
+ * In the case the table already exists, behavior of this function
depends on the
+ * save mode, specified by the `mode` function (default to throwing an
exception).
+ *
* @since 1.4.0
*/
def saveAsTable(tableName: String): Unit = {
- val cmd =
- CreateTableUsingAsSelect(
- tableName,
- source,
- temporary = false,
- partitioningColumns.map(_.toArray).getOrElse(Array.empty[String]),
- mode,
- extraOptions.toMap,
- df.logicalPlan)
- df.sqlContext.executePlan(cmd).toRdd
+ if (df.sqlContext.catalog.tableExists(tableName :: Nil)) {
+ if (partitioningColumns.isDefined) {
+ sys.error("Inserting data into an existing partitioned table is
not yet supported.")
--- End diff --
Well, double checked, we don't support converting partitioned (Parquet)
Hive metastore tables.
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